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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int main(void) {
  5.   double x;
  6.   unsigned char dbl[sizeof x];                             /* real constant */
  7.  
  8.   /* make x's format have a 1 bit on the "correct" place */
  9.   x = 32.000000000000004;
  10.   memcpy(dbl, &x, sizeof x);
  11.   switch (dbl[0]) {
  12.     case sizeof *dbl: puts("1"); break;                    /* real constant */
  13.     case 0: puts("0"); break;
  14.     default: puts("other");
  15.   }
  16.   return 0;
  17. }
Success #stdin #stdout 0s 5300KB
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https://ideone.com/tKg6dV
language:
C (gcc 8.3)
created:
1 year ago
visibility:
secret

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